Thiosemicarbazide modified magnetic graphene oxide adsorbent and preparation method and application thereof

A technology of thiosemicarbazide and oxide stone, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problems of low adsorption capacity and low selectivity, and achieve specific surface area The effect of large, simple preparation method and easy separation

Inactive Publication Date: 2020-06-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the disadvantages of low adsorption capacity and low selectivity of existing magnetic graphene oxide adsorbents, the present invention provides a preparation method of a modified magnetic graphene oxide adsorbent that is easy to separate, has high selectivity and can be reused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Provided thiosemicarbazide modified magnetic graphene oxide adsorbent, its preparation method, comprises the steps:

[0040] (1) 0.6g FeCl 3 ·6H 2 O and 0.3 g FeCl 24H 2 O was dissolved in 20 mL of water, 0.12 g of graphene oxide was dispersed in 50 mL of water by ultrasonic waves, and then the three were transferred to a 250 mL round bottom flask to obtain a mixed solution.

[0041] (2) 13mL of ammonia water (volume fraction is 25%) is added in the mixed solution described in step (1), heating and stirring treatment, the temperature of heating and stirring treatment is 70 ℃, the stirring rate of heating and stirring treatment is 600rpm, heating and stirring treatment The time is 70min to obtain the mixed solution.

[0042] (3) The heated mixed solution described in step (2) is centrifuged, the centrifugation rate is 8000rpm, and the centrifugation time is 30min, the precipitate is taken, washed with distilled water and absolute ethanol, dried in a drying oven, and ...

Embodiment 2

[0048] Provided thiosemicarbazide modified magnetic graphene oxide adsorbent, its preparation method, comprises the steps:

[0049] (1) 0.8g FeCl 3 ·6H 2 O and 0.3 g FeCl 2 4H 2 O was dissolved in 20 mL of water, 0.12 g of graphene oxide was dispersed in 100 mL of water by ultrasonic waves, and then the three were transferred to a 250 mL round bottom flask to obtain a mixed solution.

[0050] (2) 14mL of ammonia water (volume fraction is 25%) is added in the mixed solution described in step (1), heating and stirring treatment, the temperature of heating and stirring treatment is 90 ℃, the stirring speed of heating and stirring treatment is 1300rpm, heating and stirring treatment The time is 50min to obtain the mixed solution.

[0051] (3) Centrifuge the heated mixed solution described in step (2), the centrifugation rate is 10000rpm, and the centrifugation time is 15min. Take the precipitate, wash it with distilled water and absolute ethanol, and dry it in a drying oven at...

Embodiment 3

[0057] Provided thiosemicarbazide modified magnetic graphene oxide adsorbent, its preparation method, comprises the steps:

[0058] (1) 0.7g FeCl 3 ·6H 2 O and 0.3 g FeCl 2 4H 2 O was dissolved in 20 mL of water, 0.12 g of graphene oxide was dispersed in 75 mL of water by ultrasonic waves, and the three were transferred to a 250 mL round bottom flask to obtain a mixed solution.

[0059] (2) 10mL of ammonia water (volume fraction is 25%) is added in the mixed solution described in step (1), heating and stirring treatment, the temperature of heating and stirring treatment is 80 ℃, the stirring rate of heating and stirring treatment is 1000rpm, heating and stirring treatment The time is 62min to obtain the mixed solution.

[0060] (3) Centrifuge the heated mixed solution described in step (2), the centrifugation speed is 9000rpm, and the centrifugation time is 22min, take the precipitate, wash with distilled water and absolute ethanol, dry in a drying oven, and the drying tem...

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Abstract

The invention discloses a thiosemicarbazide modified magnetic graphene oxide adsorbent and a preparation method and application thereof. The method comprises the following steps: respectively dissolving graphene oxide, FeCl3. 6H2O and FeCl2. 4H2O in water, adding ammonia water, carrying out a heating reaction process to obtain magnetic graphene oxide, dispersing the magnetic graphene oxide in water, mixing the solution with a thiosemicarbazide solution, heating the mixture to react, and purifying the product to obtain the adsorbent. According to the method, graphene oxide is used as a carrier,ferroferric oxide particles are endowed with magnetism, thiosemicarbazide is used as a modifier, and the modified magnetic graphene oxide adsorbent which is good in adsorption performance, easy to separate and good in selectivity is prepared. The modified graphene oxide adsorbent provided by the invention has the characteristics of being simple to prepare, capable of being desorbed, regenerated and repeatedly used, large in specific surface area, good in adsorption effect, easy to separate, capable of adsorbing and selecting Hg < 2 + > and the like. The modified magnetic graphene oxide adsorbent can effectively realize adsorption and removal of heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to a thiosemicarbazide-modified magnetic graphene oxide adsorbent and a preparation method and application thereof. Background technique [0002] Over the past few decades, rapid urbanization and industrialization have led to the discharge of large amounts of heavy metal ions into aquatic systems, bringing potential hazards and global concerns due to their extremely high toxicity, carcinogenicity, and bioaccumulation in living organisms. In recent years, scientists have studied a variety of methods to eliminate or reduce the concentration of heavy metal ions in water, including reduction methods, electrochemical methods, biological methods, chemical precipitation methods, ion exchange methods, and adsorption methods. Among them, the adsorption method has the advantages of simple operation, high efficiency, easy recovery and regeneration of the ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/06B01J20/20B01J20/22B01J20/28009B01J2220/46B01J2220/4806B01J2220/4812C02F1/283C02F1/285C02F2101/20
Inventor 葛华才查少秋
Owner SOUTH CHINA UNIV OF TECH
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